Sandi and Alan are joined by Ade Adepitan, Nish Kumar and Holly Walsh.

Sandi looks at quacks with Claudia Winkleman, Stephen K Amos and Victoria Coren Mitchell.

Sandi Toksvig quarrels with Jason Manford, Aisling Bea, Anuvab Pal and Alan Davies.

Enjoy some quintessential QI with Cariad Lloyd, Holly Walsh and Josh Widdicombe.

Sandi looks at quirky questions with Alan, Loyiso Gola, Jason Manford and Sarah Millican.

Another selection of the best moments from Series P of QI, hosted by Sandi Toksvig.

A selection of the best moments from the 'P' series of QI, hosted by Sandi Toksvig .

Sandi Toksvig opens the post with Alan Davies, Matt Lucas, Holly Walsh and Susan Calman.

Sandi Toksvig looks at the pastimes of past times.

Sandi Toksvig looks at pathology with Sindhu Vee, Rhod Gilbert, Ed Byrne and Alan Davies.

Sandi looks at phenomena with Alan Davies, Josh Widdicombe, Cariad Lloyd and Paul Sinha.

Sandi gets round to a bit of procrastination with Aisling Bea, Holly Walsh and Nikki Bedi.

Sandi and Alan are joined by Phill Jupitus, Cally Beaton and Rhod Gilbert.

Sandi and Alan consider pain and punishment with Jimmy Carr, Lee Mack and Alice Levine.

Sandi Toksvig has a Christmas knees-up in the pub.

Sandi looks at plants with Alan Davies, Sara Pascoe, Stephen K Amos and Jason Manford.

Sandi has a picnic with Alan Davies, Romesh Ranganathan, Rachel Parris and Richard Osman.

Sandi looks at pictures with Alan Davies, Hannah Gadsby, Noel Fielding and Joe Lycett.

Sandi and Alan are joined by Victoria Coren Mitchell, Phill Jupitus and Bridget Christie.

Sandi looks at various parts with Sara Pascoe, Ed Balls, Johnny Vegas and Alan Davies.

Sandi looks at some piecemeal topics with Jimmy Carr, Gyles Brandreth and Sally Phillips.

Sandi Toksvig looks at peril with Aisling Bea, Lee Mack, Jason Manford and Alan Davies.

Sandi looks at animals with Alan Davies, Phill Jupitus, Danny Baker and Teri Hatcher.

A selection of the best moments from the O Series of QI, hosted by Sandi Toksvig.

A selection of the best moments from the O Series of QI, hosted by Sandi Toksvig.